About This Place
Affton is an unincorporated inner-ring suburb of St. Louis, located in St. Louis County, Missouri, USA. As of the 2010 census, the community had a total population of 20,307.
Affton is located at 38°33'4" North, 90°19'25" West (38.551052, -90.323614).
According to the United States Census Bureau, the community has a total area of 4.6 square miles (11.9 km²), of which, 4.6 square miles (11.9 km²) of it is land and none of it is covered by water.